Electric annunciator.



No. 841,307. PATENTED JAN. 15, 1907. G- BLAKE.

ELECTRIC ANNUNGIATOR.

APPLICATION FILED NOV. 29, 1905.

mm. X

UNITED STATES WESTERN ELECTRIC COMPANY.

RATION ILLINOIS.

or CHICAGO, ILLINOIS, A com csasc'mlc ANNuNcmToa.

' Specification of Letters Patent. Application filed November 29,1905.Serial No. 289,565.

Patented Jan. 16, 1907.

To all whom it may concern.-

Be it known that 1, CHARLES C. BLAKE, a citizen of the United States,resi at Brookline, in the county of Norfolk and tate of Massachusetts,have invented a certain new and useful Improvement in ElectricAnnunciators, of which the following is a full, clear, concise;and-exact description.

My invention relates to electric annunciators 111 which a signal targetis held in a receptacle containing an opaque or colored liquid and isadapted to be moved toward and from a transparent window of the recetacle, the face of the target being visible only when in proximity tothe window.

The object of my invention isto provide a durable construction in whichthe o eration of the signal is ra id and certain and in which there isno ossiiiilit of the liquid escaping into the 001' s of the eectromagnet.

In a well-known form of annunciator, of

which my present invention constitutes an improvement, the opaqpe liquidand the target are held in a cham er forming an exten sion of the shellinclosing the annunciatormagnet. With this construction there may be aliability of the liquid to .escape into the coil of the electromagnetand injure the same. Furthermore, when the face of the target is incontact with the glass window there is a tendency of the two surfaces toadhere, so that the armature does not readily and rapidly respond to theattraction of its magnet. By my invention these objections are entirelyovercome.

In my invention the chamber or receptacle containing the fluid isseparate from the inclosing shell of the annunciatormagnet. The magnetis secured on the rear of a mounting-strip and the receptacle containingthe fluid is so arately mounted on the front thereof. The face of thetarget has a grooved surface, which allows a free circulation of theliquid and overcomes the tendency of the target to adhere to the window.

I will describe my invention more particularly by reference to theaccompanying draws, in which igure 1 is a front elevation of two of myannunciators secured to a mounting-strip, one of the annunciators beingshown as displaying its signal. 2 is a section on the inc 2 2 of Fig. 1,showing the signal in proxtion with parts broken away, showing thearmature attracted by the electromagnct. Fig. 4 is a section on the line4 4 of Fi 2. Fig. 5 is a perspective view of the signa -target.

The same letters of reference are used to designate the same partswherever they are.

'shown.

The electromagnet a is inclosed in a shell I; and is secured on the railof a mounti -strip 0 about an openin c therein, prefera ly by.

screwing the core in a threaded perforation in a brass disk e, securedin an opening in said imity to the window. 3 is a similarsecmounting-strip. Separately mounted in any suitable manner on the faceof the strip 0 is a hermetically-sealed receptacle f, ha a transparentwindow or face g of glass. nclosed within this receptacle is thearmature h of the ma net and a colored liquid '11. The liquid may eintroduced into the receptacle through a passage closed by the screw m.The armature is secured to a white glass target k, which is vislble onlywhen in contact with the glass window g.

The armature is cut away to form a recess t for asupport s. A hole u,extendin from the upper end of the recess, receives t e upper end of thetilting su ort s, the lower end of which is pivotally helil in a grooven in the floor of the receptacle f.

The armature his so supported that the signal tar et la is in proximityto the window and is visible therethrough when the armature is notattracted by the magnet. When the electromagnet is energized, the target7:: is drawn inward and concealed by the fluid.

Any other suitable means of normally holding the face of the armatureagainst the window may be used, and the particular means here shown anddescribed is not an essential 'feature of my invention. I

Grooves Z, extending across the surface of the target, facilitate theescape of the liquid from between the face of the target and the windowwhen the armature is moving toward the window and also facilitate therapid motion of the liquid in between the target and the Window when thearmature is attracted. The tendency of a film of the liquid to cause theface of the target to adhere to the glass window is thus overcome, andthe operation of the signal is rapid and certain.

- The receptacle f is of course composed of some non-magnetic substanceand is prefer-V ably metallic. Any suitable non-corrosive hquid may beused in the receptacle. I have found that commercial benzole, suitablycolored, preferably cutting asphalt in the benzole to give the esired dethoi color, is

thorou hly satisfactory and particularly ada te to use with myannunciator. I at I,claim is- 1. In an annunciator, the combination witha receptacle inclosing. a si al-target and a colored liquid, and rovi edwith a transparent window throug which the tarfrom the shell 0 and acolored liquid inelosed in said chamber,

get is visible when in contact therewith, an electromagnet and itsinclosingshell, separate from said rece tacle, and-an armature connectedwith sai signal-target to operate thesame. I 2. In an annunciator, thecombination with an electromagnet and its inclosing shell, of ahermetically-sealed chamber separate the magnet, an armature atarget-signal secured to the armature, and a transparent windowin thechamber through which thetarget is visible when the magnet isdenergized.

target and provided wit 3. In an annunciator, the combination with anelectromagnet, of a plate upon the rear of a which said magnet ismounted, a hermetically-sealed chamber separately mounted on the frontof the plate, an armature and a colored liquid inclosedin said chamber,a target secured to the armature,

and a transparent window the chamber through which the-target is visiblewhen the magnetisd'e'nergized.

4. In an annunciator, the combination with a signal-target havinggrooved channels across its face, a receptacle inclosing said atransparent window, a colored fluid in'the receptacle, an

-electromagnet,'and an armature connected with the target to operate thesame.

5. In an annunciator, the combination w1th an electromagnet, of a plateupon the rear of which said magnet is mounted, a "hermetically sealedchamber separately target to operate the same.

mounted on the front of the plate, a signal target having groovedchannels across its face 'inclosed in said chamber, an opaque liquid inthe chamber, an armature secured to the target, and a window in thechamber toward and from which the armature is adapted to move thetarget.

6. In an annunciator, the combination with a hermetically-sealedreceptacle having a transparent face, of a plate upon the face of whichsaid receptacle is mounted, a fluid composed of colored benzole inclosedin said receptacle, a signal-target. movable in the receptacle towardand from the face thereof, an electromagnet separately mounted upon therear of said late, and an armature adapted to operate t e target.

7. In" an, annunciator, the combination with a hermeticallyssealedreceptacle, of 'a fluid composed of benzole colored with asa liquid insaid rece tacle, a signal-target in said liquid, means or preventing theadhesion of the target to the window, an electromagnet, and an armatureconnected with the tar et to operate the same.

a witness whereof I hereunto subscribe my name this 4th day ofSeptember, A. D.

CHARLES .0. BLAKE. Witnesses:

SAMUEL HEIMLICH, E. J. BURKE.

ophaltum inclosed therein, a signal-target

